Case Environmental
Case Environmental

Chlorination Certificates & Disinfection

Located in the south of the UK, we provide professional chlorination services and UKAS testing across the country.  Our chlorinators are WIAPS (WRAS) registered and hold EUSR National Water Hygiene Cards, SHEA Water and CSCS.


EMAIL or complete the form below. 

OFFICE: 01626 249 042


Chlorination Certificate   Most new service pipe connections to water company mains require a  chlorination certificate and UKAS laboratory testing before the connection is made.  Requirements vary for different water companies but for most, pipes over a certain size/length (or potentially contaminated) must be chlorinated.  Chlorination is also required for conversion from a private water supply to mains water. 


Chlorination is often a contract requirement for the commissioning/handover process for new buildings (commercial & domestic) where new pipes, plumbing, tanks and fittings have been installed.


Chlorination normally takes place a week before the connection is due to be made.  Pipe work must be installed and protected in accordance to hygienic practices with open ends securely protected using mechanical compression fittings.


We chlorinate in compliance to the British Standards; BS 6700, BS EN 806 or BS 8558.


Our chlorination services are used by leading national & international brands, businesses and organisations.


Why is Chlorination Required?  Chlorination ensures that the pipe work is clean and free from contamination.  Chlorination is important for new installed pipes/plumbing, existing plumbing or where contamination is suspected.  For most sites we offer a free repeat chlorination if the microbiological test fails.


The Chlorination Process  Proportional chlorine dosing equipment is used to ensure the exact chlorine residual is achieved.  Chlorine levels are electronically measured using a photometer and microbiological samples are tested in an UKAS laboratory.  Materials, products and chemicals used are approved for use in contact with drinking water.  This includes ultra low bromate sodium hypochlorite.

  1. Flush/swab pipe work/tank/reservoir with mains water.  Record background chlorine residual.
  2. Introduce 50ppm (mg/l) chlorine solution.
  3. Allow 50ppm chlorine to sit in contact for 1 hour.
  4. Flush pipe work until start chlorine level is reached, de-chlorinating water as necessary.  Test & record onsite parameters.
  5. If collecting a UKAS microbiological sample, wait 30 minutes prior to sample collection.

Last Minute/Same Day/Emergency Chlorination Certificate?  If you need a last minute, same day chlorination certificate, please give us a call to see if we can help.


Chlorination after prolonged period of non-use  The HSE document; Legionnaires’ disease Part 2: The control of legionella bacteria in hot and cold water systems details the actions to take when recommissioning plumbing systems taken out-of-use (and not regularly flushed).  Paragraph 2.52 on page 24 states that prior to ue the system should be treated as a new installation and cleaned, flushed and disinfected;


As well as commercial buildings, disinfection by chlorination should be considered for domestic/rented properties such as those that have been unoccupied for a prolonged period prior to new owners/tenants.  Chlorination services can also be provided for the following;

  • Tank chlorination
  • Tower blocks
  • Refit of Office, Shop, restaurant and cafe chlorination
  • Rental properties chlorination
  • Hotel & holiday park chlorination
  • Chlorination of new build properties 
  • Emergency chlorination (burst main, contamination)
  • Commissioning of new buildings chlorination
  • Legionella - disinfection to HSE ACOP L8 (Legionnaires' disease. The control of legionella bacteria in water systems)
  • Water system hygiene management and systems not in regular use or flushed
  • Annual or routine system maintenance.

Water Company Chlorination Requirements and Guidance  These are subject to change and are not the same across the UK water industry;

Your form message has been successfully sent.
You have entered the following data:

Chlorination quote

Please correct your input in the following fields:
Error while sending the form. Please try again later.

Note: Fields marked with * are required

Locations covered by Case Environmental include (but are not limited to);


Bedfordshire, Berkshire, Bristol, Buckinghamshire, Cambridgeshire, Cheshire, City of London, Cornwall, Cumbria, Derbyshire, Devon, Dorset, County Durham, East Riding of Yorkshire, East Sussex, Essex, Gloucestershire, Greater London, Greater Manchester, Hampshire, Herefordshire, Hertfordshire, Isle of Wight, Kent, Lancashire, Leicestershire, Lincolnshire, Merseyside, Norfolk, North Yorkshire, Northamptonshire, Northumberland, Nottinghamshire, Oxfordshire, Rutland, Shropshire, Somerset, South Yorkshire, Staffordshire, Suffolk, Surrey, Tyne and Wear, Warwickshire, West Midlands, West Sussex, West Yorkshire, Wiltshire, Worcestershire, Bath, Birmingham, Bradford, Brighton & Hove, Bristol, Carlisle, Cambridge, Canterbury, Chester, Chichester, Coventry, Derby, Durham, Ely, Exeter, Gloucester, Hereford, Kingston-upon-Hull, Lancaster, Leeds, Leicester, Lichfield, Lincoln, Liverpool, London, Manchester, Newcastle-upon-Tyne, Norwich, Nottingham, Oxford, Peterborough, Plymouth, Portsmouth, Preston, Ripon, Salford, Salisbury, Sheffield, Southampton, St Albans, Stoke-on-Trent, Sunderland, Truro, Wakefield, Wells, Westminster, Winchester, Wolverhampton, Worcester and York.



Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Pembrokeshire, Powys, Rhondda Cynon Taff, Swansea, Torfaen, Vale of Glamorgan, Wrexham, Bangor, Cardiff, Newport, St Davids and Swansea.



Ayrshire, Dumfries and Galloway, Edinburgh and The Lothians, Glasgow and Clyde Valley and The Borders.


London Boroughs

Barking and Dagenham, Barnet, Bexley, Brent, Bromley, Camden, City of London, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington and Chelsea, Kingston upon Thames, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth and Westminster.


Water Companies

Affinity Water, Albion Water, Anglian Water, Bournemouth Water, Bristol Water, Cambridge Water Company, Cholderton and District Water Company, Dee Valley Water, Dŵr Cymru Welsh Water, Essex and Suffolk Water, Hartlepool Water, Northumbrian Water, Portsmouth Water, Severn Trent Water, South East Water, Southern Water, South Staffordshire Water, South West Water, Sutton and East Surrey Water, Thames Water, United Utilities, Wessex Water, Yorkshire Water and Youlgrave Waterworks.

Example Chlorination/Disinfection Certificate PDF
Example Chlorination Certificate.pdf
Adobe Acrobat document [270.8 KB]
Print | Sitemap
© Case Environmental


M: 07795 518 796

L: 01626 249 042